Prime or Composite Calculator

Prime or Composite Calculator

Use Grinebiter's calculator to find out if a number is composite or prime.

It is very easy to use! This calculator will not only give you the answer, but also show you how it came up with the answer. All you have to do is enter the number in the box below.

No idea about what number you want to check to see if it's prime or composite? Here are some recent searches using our Prime or Composite Calculator:

Is 39 prime or composite?

Is 127 prime or composite?

Is 512 prime or composite?

Is 999 prime or composite?